Axispharm offers you high-purity PC SPDP as a photocleavable linker and a SPDP moiety. SPDP is an amine and thiol reactive crosslinker. It is also membrane permeable, allowing it to participate in cross-linking reactions within cells.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.